EP0802948A1 - Schlagzäh modifizierte thermoplastische formmasse mit verbesserter wärmealterungsbeständigkeit und verfahren zu ihrer herstellung - Google Patents
Schlagzäh modifizierte thermoplastische formmasse mit verbesserter wärmealterungsbeständigkeit und verfahren zu ihrer herstellungInfo
- Publication number
- EP0802948A1 EP0802948A1 EP95941635A EP95941635A EP0802948A1 EP 0802948 A1 EP0802948 A1 EP 0802948A1 EP 95941635 A EP95941635 A EP 95941635A EP 95941635 A EP95941635 A EP 95941635A EP 0802948 A1 EP0802948 A1 EP 0802948A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistance
- tocopherol
- mixture
- impact
- modified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1545—Six-membered rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/372—Sulfides, e.g. R-(S)x-R'
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
Definitions
- the invention relates to the stabilization of polymer plastics, in particular of the ABS type, with mixtures containing ⁇ -tocopherol (vitamin E).
- ⁇ -tocopherol is a naturally occurring antioxidant which can also be produced industrially in the form of the racemate and is used in food preservation but can also be used to stabilize industrially produced polymers (DE-A-1 114 319 and 1 136 102 ), especially those that are to be used in food packaging.
- Mixtures of several stabilizers containing ⁇ -tocopherol should have a particularly favorable effect on polymer plastics.
- EP-A-408 693 proposes the use of fatty acid glycerides as costabilizers.
- the use of phosphorus or sulfur-containing costabilizers is recommended for materials containing polyethylene.
- Stabilizer mixtures containing ⁇ -tocopherol for stabilizing plastics are also described in Japanese patent publications 009887, 100361 and 142537.
- the stabilizers or their mixtures are the plastic masses in the usual manner, i.e. added in processing in solid form.
- the object of the invention is therefore to produce a graft rubber which is stabilized against oxidation and contains polybutadiene and contains a mixture of ⁇ -tocopherol and sulfur-containing stabilizers from the group of thiodipropionic acid esters and which contains the stabilizers in the most effective form possible and in a uniformly fine distribution.
- mixtures of ⁇ -tocopherol and sulfur-containing stabilizers from the group of thiodipropionic acid esters with graft rubbers containing polybutadiene are advantageously obtained by mixing the constituents in the form of an emulsion or dispersion, and the mixture is precipitated as required and dehydrated dry.
- These mixtures - either as latex or in dewatered form - can be incorporated into a polymer melt of a hard polymer material in a manner known per se.
- Immediate subject matter of the invention is a process for the production of graft rubbers containing polybutadiene and stabilized with - preferably 0.005 to 0.5% by weight of ⁇ -tocopherol and 0.005 to 0.5% by weight of a thiodipropionic acid ester
- Amount of an emulsion or dispersion of ⁇ -tocopherol and a thiodipropionic acid ester added and the mixture, if necessary, dewatered and the rubber is obtained, and the mixtures prepared in this way, be it in the form of their emulsion / dispersion, be it in dewatered and / or processed form, be it in the form of the impact modified thermoplastic molding composition with the graft rubber with improved heat aging resistance.
- the invention can be used with particular advantage to improve the heat aging resistance of SAN or ABS molding compounds.
- molding compositions are generally known; for their manufacture and equipment against heat aging, reference is made to Gumbleter / Müller: Kunststoffadditive, 3rd edition, Carl Hanser Verlag, Kunststoff 1990.
- Thiodipropionic acid esters and ⁇ -tocopherol are advantageously used in a weight ratio of 0.5: 1 to 10: 1; a quantitative ratio of 1: 1 to 8: 1, in particular 1.5: 1 to 5: 1, is preferred.
- Two polybutadiene-g SAN graft rubber latices were produced, each of which had a bimodal particle size distribution; one was obtained by the process described in DE-A-2427 960 and the other by the process described in EP-A-258 741.
- a stabilizer emulsion was especially obtained by mixing 20 g of a mixture of 33% by weight of ⁇ -tocopherol and 66% by weight of dialauryl thiodipropionate (available under the trade name Irganox PS 800) at 60-80 ° C. together with 2 g of stearic acid melted and were intensively stirred with 40 g of aqueous 0.1% potassium hydroxide solution. This emulsion is stable for several days.
- Another stabilizer emulsion was obtained by stirring a stabilizer melt of 1 part by weight of ⁇ -tocopherol and 2 parts by weight of dilauryl thiodipropinate with an aqueous emulsifier solution of 6.9 g of potassium stearate and 120.6 g of water. This emulsion is stable over long periods of time.
- K stearate Na alkyl sulfonate or sulfosuccinic acid ester is also suitable.
- Standard small rods were injected as test specimens from the stabilized, impact-modified molding compound at 250 ° C. After storage of different durations at 110 ° C., the degree of discoloration (visually) and the drop in mechanical resistance to impact stress were determined. The limit value of the storage period when the (notched) test specimen breaks is given.
- DLTPP dilauryl thiodipropionate
- AT ⁇ -tocopherol
- LD-_ao heat storage of the rubber alone at 180 ° C until decomposition (minutes)
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Graft Or Block Polymers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4442881A DE4442881A1 (de) | 1994-12-02 | 1994-12-02 | Schlagzäh modifizierte thermoplastische Formmasse mit verbesserter Wärmealterungsbeständigkeit und Verfahren zu ihrer Herstellung |
| DE4442881 | 1994-12-02 | ||
| PCT/EP1995/004718 WO1996017010A1 (de) | 1994-12-02 | 1995-11-30 | Schlagzäh modifizierte thermoplastische formmasse mit verbesserter wärmealterungsbeständigkeit und verfahren zu ihrer herstellung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0802948A1 true EP0802948A1 (de) | 1997-10-29 |
| EP0802948B1 EP0802948B1 (de) | 2000-02-02 |
Family
ID=6534699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95941635A Expired - Lifetime EP0802948B1 (de) | 1994-12-02 | 1995-11-30 | Schlagzäh modifizierte thermoplastische formmasse mit verbesserter wärmealterungsbeständigkeit und verfahren zu ihrer herstellung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0802948B1 (de) |
| DE (2) | DE4442881A1 (de) |
| ES (1) | ES2143086T3 (de) |
| WO (1) | WO1996017010A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5434352A (en) * | 1977-08-22 | 1979-03-13 | Riken Vitamin Co Ltd | Non-toxically stabilized olefinic polymer composition |
| US4489099A (en) * | 1983-02-28 | 1984-12-18 | The Goodyear Tire & Rubber Company | Vitamin E/DLTDP stabilizer system for chewing gum SBR |
| DE4306593A1 (de) * | 1993-03-03 | 1994-09-08 | Hoechst Ag | Stabilisierte Formmasse aus Polyethylen, ein Verfahren zur Herstellung und Verwendung |
| EP1028142A3 (de) * | 1993-05-12 | 2001-03-28 | General Electric Company | Synergistisches Stabilisatorsystem |
-
1994
- 1994-12-02 DE DE4442881A patent/DE4442881A1/de not_active Withdrawn
-
1995
- 1995-11-30 EP EP95941635A patent/EP0802948B1/de not_active Expired - Lifetime
- 1995-11-30 ES ES95941635T patent/ES2143086T3/es not_active Expired - Lifetime
- 1995-11-30 DE DE59507756T patent/DE59507756D1/de not_active Expired - Fee Related
- 1995-11-30 WO PCT/EP1995/004718 patent/WO1996017010A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9617010A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2143086T3 (es) | 2000-05-01 |
| DE4442881A1 (de) | 1996-06-05 |
| DE59507756D1 (de) | 2000-03-09 |
| WO1996017010A1 (de) | 1996-06-06 |
| EP0802948B1 (de) | 2000-02-02 |
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